Looking for a great IVR system to host my service

I need to write myself an Integrated Voice Response system, but am holding off on writing it until I finf the right platform. I have found Voice Shot (www.voiceshot.com) to be pretty good. But it lacks speech recognition, text to speech. So I want to consider other possibilities before I start coding.

Do you know of any other options?

I assume Voice Shot's technology is not that unique and that others have offerings as well. Please let me know.

I mainly want the caller to interact with my menu of options with the phone keypad, but would not want to start from scratch the day I decided I needed voice rec. Also, the text to speech I would like to have on version 1.0 of my service.

Let me know...

I do not think I need a VOIP solution. Voice Shot may use POTS lines, and this is probably preferred.

Here is something i posted a few months ago. You can install this free software on a PC or laptop. I like useing an old laptop because it thenhas an internal UPS. Look at voicepulse.com for sip service. You get 4 lines and one number for $11 per month.

I would use trixbox as my platform for my Asterisk call manager. It uses a great web GUI (Free PBX) on top of it and that makes the trunks and devices much easier to configure for the average user.

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